| Acronym | Definition |
|---|
| MHAO➣Manufactured Housing Association of Oklahoma |
| MHAO➣Mohamed Hareb Al Otaiba (business group; United Arab Emirates) |
| MHAO➣Minor Hockey Alliance of Ontario (Stratford, Ontario, Canada) |
| MHAO➣Morgan Horse Association of Oregon |
| MHAO➣Mental Health Association of Oregon (aka Mental Health America of Oregon) |
| MHAO➣Mental Health America of Oregon (aka Mental Health Association of Oregon) |